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How do you recalibrate a scale because it's reading 78kg out of 100kg, automatically the remaining 22kg is nowhere? Assuming you want to scale anything above 25kg, it will indicates that the scale is full it can't read it again.
Okay, here is where recalibrate is needed when you are facing issues like this.
For example you have an object that weigh 25kg and you are sure of that object weight that it can't change from 25kg. And you now place such object on your scale and it appear 24.5 or even below. That shows the scale needs to be recalibrate. The after recalibration the object will surely give you 25kg or 24.99kg .
That shows your scale as come back to normal way. There are factors to consider in scaling. One of it is positioning and which might be caused by the topography or ground surface.
But with this kind of issue, the scale might need repair or recalibration. But mind you, there are some scale you can't recalibrate.